Generate a device token for Android

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private val requestPermissionLauncher = registerForActivityResult(
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    ActivityResultContracts.RequestPermission(),
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) { isGranted: Boolean ->
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    if (isGranted) {
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        // FCM SDK (and your app) can post notifications.
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    } else {
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        // Inform the user that notifications are disabled.
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    }
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}
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private fun askNotificationPermission() {
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    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
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        if (ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS) ==
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            PackageManager.PERMISSION_GRANTED
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        ) {
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            // Permission already granted.
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        } else {
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            requestPermissionLauncher.launch(Manifest.permission.POST_NOTIFICATIONS)
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        }
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    }
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}

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private final ActivityResultLauncher<String> requestPermissionLauncher =
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    registerForActivityResult(new ActivityResultContracts.RequestPermission(), isGranted -> {
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        if (isGranted) {
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            // FCM SDK (and your app) can post notifications.
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        } else {
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            // Inform the user that notifications are disabled.
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        }
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    });
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private void askNotificationPermission() {
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    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
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        if (ContextCompat.checkSelfPermission(this, Manifest.permission.POST_NOTIFICATIONS) ==
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                PackageManager.PERMISSION_GRANTED) {
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            // Permission already granted.
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        } else {
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            requestPermissionLauncher.launch(Manifest.permission.POST_NOTIFICATIONS);
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        }
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    }
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}

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FirebaseMessaging.getInstance().token.addOnCompleteListener { task ->
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    if (!task.isSuccessful) {
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        Log.w(TAG, "Fetching FCM registration token failed", task.exception)
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        return@addOnCompleteListener
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    }
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    val token = task.result
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    // Send this token to Twilio using the DeviceRegistrations API
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    // or include it directly in a PushNotifications request.
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}

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FirebaseMessaging.getInstance().getToken()
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    .addOnCompleteListener(task -> {
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        if (!task.isSuccessful()) {
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            Log.w(TAG, "Fetching FCM registration token failed", task.getException());
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            return;
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        }
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        String token = task.getResult();
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        // Send this token to Twilio using the DeviceRegistrations API
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        // or include it directly in a PushNotifications request.
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    });

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class MyFirebaseMessagingService : FirebaseMessagingService() {
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    override fun onNewToken(token: String) {
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        // Send the updated token to your server.
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        sendRegistrationToServer(token)
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    }
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}

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public class MyFirebaseMessagingService extends FirebaseMessagingService {
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    @Override
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    public void onNewToken(@NonNull String token) {
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        // Send the updated token to your server.
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        sendRegistrationToServer(token);
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    }
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}